diff --git a/lib/newdb b/lib/newdb
index 4c95494..f6ee501 100755
--- a/lib/newdb
+++ b/lib/newdb
@@ -227,6 +227,7 @@ olcConstraintAttribute: supannEtablissement,
  supannEtuTypeDiplome,
   regex "^\{[^}]+\}.*$"
 olcConstraintAttribute: supannEtuAnneeInscription regex "^[0-9][0-9][0-9][0-9]$"
+olcConstraintAttribute: pslBadgeCSN regex "^[0-9A-F]{8,14}$"
 
 add olcOverlay={4}unique,olcDatabase={2}mdb,cn=config
 objectClass: olcOverlayConfig